mgag200_drv.c:undefined reference to `remove_conflicting_framebuffers'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   329f4152911c276b074bec75a0443f88821afdb7
commit: 339b19e3c4ff728a5dcdbd388a5fbe83c1aabc37 drm/ast: make fbdev support 
really optional
date:   4 weeks ago
config: x86_64-randconfig-x000-201633 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        git checkout 339b19e3c4ff728a5dcdbd388a5fbe83c1aabc37
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `mgag200_driver_load':
   (.text+0x44d801): undefined reference to `remove_conflicting_framebuffers'
   drivers/built-in.o: In function `mga_pci_probe':
>> mgag200_drv.c:(.text+0x4570c0): undefined reference to 
>> `remove_conflicting_framebuffers'
   drivers/built-in.o: In function `vmw_fb_init':
>> (.text+0x480bc1): undefined reference to `framebuffer_alloc'
   drivers/built-in.o: In function `vmw_fb_init':
>> (.text+0x481a4d): undefined reference to `fb_deferred_io_init'
   drivers/built-in.o: In function `vmw_fb_init':
>> (.text+0x481a55): undefined reference to `register_framebuffer'
   drivers/built-in.o: In function `vmw_fb_init':
>> (.text+0x481a6b): undefined reference to `fb_deferred_io_cleanup'
   drivers/built-in.o: In function `vmw_fb_init':
>> (.text+0x481aa0): undefined reference to `framebuffer_release'
   drivers/built-in.o: In function `vmw_fb_close':
   (.text+0x481b70): undefined reference to `fb_deferred_io_cleanup'
   drivers/built-in.o: In function `vmw_fb_close':
>> (.text+0x481b85): undefined reference to `unregister_framebuffer'
   drivers/built-in.o: In function `vmw_fb_close':
   (.text+0x481bca): undefined reference to `framebuffer_release'
   drivers/built-in.o: In function `nouveau_drm_probe':
   nouveau_drm.c:(.text+0x6456c7): undefined reference to 
`remove_conflicting_framebuffers'
   drivers/built-in.o: In function `bochs_pci_probe':
   bochs_drv.c:(.text+0x71a8ea): undefined reference to 
`remove_conflicting_framebuffers'
   drivers/built-in.o: In function `drm_virtio_init':
   (.text+0x71facd): undefined reference to `remove_conflicting_framebuffers'

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.config.gz
Description: Binary data